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Nathan Dane
43 lines
2.4 KiB
Markdown
43 lines
2.4 KiB
Markdown
# Interface fonts
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SolidCraft bundles IBM Plex Sans as its default interface font on desktop and web.
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The unmodified variable font provides regular (400), medium (500), semibold (600)
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and bold (700) faces. Titles and selected labels use semibold; compass letters
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and the primary OK action use bold. Selection fields and status messages use
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medium. Numeric fields and sketch dimensions use IBM Plex Mono Regular.
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Both fonts are licensed under the SIL Open Font License 1.1. Their licence texts
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are in `assets/fonts/ibm-plex-sans/OFL.txt` and
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`assets/fonts/ibm-plex-mono/OFL.txt`; provenance is recorded in
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[ATTRIBUTION.md](../ATTRIBUTION.md).
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The `ui_font` preference puts the chosen font first in every sans family,
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including the three weighted families. A chosen static font retains its own
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weight; SolidCraft does not simulate bold by drawing text twice. Clearing the
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preference restores Plex. Monospace fields keep Plex Mono.
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Egui's symbol and emoji fallbacks remain available. Desktop also appends the
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available Japanese/Chinese, Hangul and Thai system fonts to every family, ordered
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for the selected language. The web app installs Plex at startup and adds its
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bundled Japanese font asynchronously when needed, preserving the interface faces
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and any font preference.
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## Type scale and metrics
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Text sizes come from `theme::Tokens`, with identical values in the light and dark
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palettes in `assets/styles/ui/palettes.rs`. The compact scale runs from
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`font_badge` (9.5 pt) through `font_heading` (14 pt). Special roles preserve the
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existing designs: `font_triad` (8), `font_compass` (13.5), `font_subtitle` (15),
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`font_intro` (16), `font_article_heading` (17), `font_title` (22), and
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`font_display` (26). Scaled labels derive from these tokens. Weight helpers in
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`fonts.rs` choose the family independently of size.
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Dense forms also use tokens for control height/radius, label width, row gap,
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header/footer/card dimensions, icons, text insets, checkbox and action heights,
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and section letter spacing. Existing `space_*` tokens supply shared padding.
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The `font_literals_tests` source guard scans production Rust, including the
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viewport icon sources, and rejects numeric font sizes, private font families
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outside `fonts.rs`, and direct dense-form spacing literals. Its small per-file
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allowance table documents graphic spinner diameters; it permits no text sizes.
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Run it with `cargo test -p solidcraft-ui-egui --lib font_literals_tests`.
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